For the number 0.00067 the power of 10 would be -5 -4 4 none of these.
The least count of vernier calliper would be 0.01mm 0.01m 0.01cm 0.1 cm.
The phenomena where a ray of light travels from one medium to another is known as reflection diffraction interference refraction.
What change takes place when a ray of light travels from one medium to another? The speed changes The speed remains constant but kinetic energy changes Nothing changes as the ray travels with same speed None of the above.
The ratio of Sin i and Sin r is a constant and that is known as angle of incidence refractive index magnification total internal reflection.
A pencil dipped in water appears bent due to total internal reflection due to refraction of light due to reflection of light due to dispersion.
The incident ray and emergent ray in a glass slab are perpendicular to each other lie on each other paralel to each other none of these.
The nature of convex lens is converging diverging both converging and diverging neither converging nor diverging.
To construct a telescope we need concave lens glass slab convex lens we can use any of the above.
Which of the following works based on total internal reflection? Prism optical fibre Microscope telescope.
Two glass rods rubed with silk repel each other due to current electricity static electricity magnetic attraction none of the above.
An apple falls down from a tree. Find the distance it will cover in 2 seconds. [a=g=10 m/s-square] 40m 30m 20m 10m.
Which of the newton's law would best explain about fact that : When a bus starts moving we tend to fall back. Newtons first law Newtons second law Newtons third law None of the laws.
When we jump from a boat the boat moves back. Which law of Newton would explain the reason? Newtons first law Newtons second law Newtons third law None of the laws.
What is the unit of force? joule watt hertz newton.
What is the unit of energy? watt newton joule seconds.
Which best explains the terms speed and velocity? Speed is vector and velocity is vector velocity is scalar and velocity is vector both are scalar speed is scalar and velocity is vector.
If force is doubled how would it affect the acceleration/ acceleration is halved acceleration is also doubled acceleration becomes four times none of these.
Which of the following best explains the conversion/transformation of energy in electric motor? kinetic to electrical electrical to kinetic electrical to potential kinetic to electric.
A ball is dropped from certain height. Which of the following would best explain the energy conversion? At top it is kinetic energy, at centre it is potential and as it touches the surface it has potential At top it is kinetic energy, at centre it is kinetic and as it touches the surface it has potential At top it is potential energy, at centre it is kinetic and as it touches the surface it has potential At top it is potential energy, at centre it is both kinetic and potential and as it touches the surface it has only kinetic.
Digital thermometers are better than mercury because [select the most appropriate answer] mercury is not available in nature anymore digital is cheap mercury is harmful and can act as pollutant for environment none of the above.
How much energy is required to raise the temperature of 2 kg of substance from 10 degree celsius to 30 degree. [C of substance is 1200 units] 4800J 48000J 480J 48J.
Substance A takes 3 min to raise its temperature by 5 degree celsius and substance B take 5 min for the same rise in temperature. Which has greater specific heat capacity ? A has greater since it takes less time B has greater since it takes more time Both have same specific heat capacity we cannot decide from given data.
We use water as coolant because [give most appropriate answer] it is cheap it has high specific heat capacity it has low specific heat capacity it is the only substance which can absorb heat.
To avoid getting electric shosk while using electrical devices which of the following is most important? use of earthing good quality of wire use of shorter wires.
Whcich type of connection is preffered in housing electrification [connections made in houses]? Series Parallel Both series and Parallel Neither series nor parallel.
Which of the following is most appropriate reason to have parallel connection in our houses? It saves energy we get more current than we need Even if one bulb will fuse others will contunue to work None of these.
Why should we wear rubber shoes while working with electrical appliances? So that we are at same height of appliance So that we can save current So that we do not get electric shock So that we do not waste energy.
Which of the statements are correct regarding magnetic field lines? They start from south and end in north They start from north and end in north They intersect with each other They never intersect with each other.
Which of the following is correct regarding earth's magnetic field? The geographical poles and magnetic poles of earth lie on same side. The geographical poles and magnetic poles of earth lie on opposite side. Earth has only geographic poles Earth has only magnetic poles.
Which of the following conditions is necessary for total internal reflection The ray of light travels from denser to rarer medium The ray of light travels from rarer to denser medium Total internal reflection does not depend on medium.
If we drop two similar object A and B from a height of 2m and 4 m then what would be the ratio of their potential energy? 1:4 4:1 1:2 1:3.
if two cars of same mass are moving with speed of 10m/s and 20 m/s then what would be the ratio of their kinetic energy. 1:2 2:1 1:6 1:4.
If we place an object at 2f in case of a convex lens then which of the following would satisfy the nature of image image is errect image is formed at focal point image is inverted none of the above.
Unit of refractive index is cm m degree no unit.